(n1: User { email: "alice@email.com" });

// No email
(n2_wrong: User { name: "Bob" });

// Wrong email without @
(n3_wrong: User { email: "carol" });

// Email with an integer
(n4_wrong: User { email: 23 });

// 2 emails
(n5_wrong: User { email: [ "email1@email.com", "email2@email.com" ] })